n. A rounded and more or less globular projection or part.n. In botany, a rounded projection or division of a leaf, fruit, or other organ of a plant.n. In zoology, a projection or part which is imperfectly separated from another part: as, the lobes of the maxillæ in insects.n. In machinery, the larger or more prominent part of a cam-wheel.n. The lobus semilunaris inferior together with the slender lobe.n. See the adjectives.n. In the septate cephalopoda like Nautilus and the ammonites, any division of the septal suture which makes a convex curve toward the apex: contrasted with saddle, which is a curvature toward the aperture.n. In the trilobites, one of the divisions of the glabella; a glabellar lobe.n. In geology, a projection from a glacier, like a peninsula: especially used of the continental ice-sheet of the glacial epoch. see ice-lobe.